MANFRED KAGE / SCIENCE PHOTO LIBRARY. MANFRED KAGE / SCIENCE PHOTO LIBRARY.
Light micrograph showing the appearance of lung alveolar tissue in a case of pulmonary emphysema, the enlargement of the air sacs (alveoli) with subsequent destruction of the alveolar walls, through whose capillaries exchange of oxygen and carbon dioxide occurs. The reduced capacity for gaseous exchange is compounded by a loss of elastic support which may cause the airways to collapse during expiration. Emphysema may coexist with chronic bronchitis, the inflammation of the bronchial mucous membrane. Resulting breathlessness may necessitate dependence on oxygen: there is no treatment. Magnification: X100 (5x4 size), X 30 (35mm size).
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